| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 2638461 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 2104677 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 1548330 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 2232990 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | THE LEAGUE SCHOOL PROVIDES EDUCATIONAL (AGES 5-21) AND MENTAL HEALTH PROGRAMS FOR STUDENTS WITH INTELLECTUAL, DEVELOPMENTAL AND/OR PHYCHIATRIC DISABILITIES. |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 29272 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 19175 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 48447 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BenefitsToMembersGrp/TotalAmt | 0 | 0 |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | VINCENT SANTO |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 7186435300 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 483 CLERMONT AVENUE |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BROOKLYN |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | NY |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 11238 |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 199861 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 165913 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 661090 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 212831 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 873921 |
| IRS990/CompDisqualPersonsGrp/TotalAmt | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 2124 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 32917 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 35041 |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | true |
| IRS990/CostOfGoodsSoldAmt | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 1092773 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 352 |
| IRS990/CYOtherExpensesAmt | 0 | 3534762 |
| IRS990/CYOtherRevenueAmt | 0 | 1120 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 14217848 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -1580627 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 13357958 |
| IRS990/CYTotalExpensesAmt | 0 | 16892720 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 15312093 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 212290 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 197719 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 3525 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 295855 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 299380 |
| IRS990/Desc | 0 | THE JOAN FENICHEL THERAPUETIC NURSERY PROVIDES SPECIAL EDUCATION AND COMPREHENSIVE MENTAL HEALTH SERVICES FOR CHILDREN AGES 3 THROUGH 5. THE PROGRAM IS OPERATIONAL FOR TWELVE MONTHS IN TWO SECTIONS; THE TEN MONTH STANDARD SCHOOL SESSION AND TWO MONTH SUMMER SESSION. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 398 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/EscrowAccountLiabilityGrp/BOYAmt | 0 | 0 |
| IRS990/EscrowAccountLiabilityGrp/EOYAmt | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 8146716 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 123454 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 123454 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 6542 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 6542 |
| IRS990/FeesForServicesLobbyingGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesManagementGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 136347 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 186777 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 323124 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignGrantsGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 10 | 16.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 11 | 16.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 12 | 16.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 13 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 14 | 16.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 15 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 19.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 19.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 19.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 35.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 19.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 35.0 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 34588 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 19537 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 16630 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 9189 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 8389 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 33342 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | COURTNEY BENENSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | ALAN GALLO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | GEORGE RICCIARDELLI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Louis Parks |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | ELAINE BRODSKY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | ALEXANDER FRANK THRU 41318 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | JEREMY WELLES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | JUSTIN LERNER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Denise Castagna as of 11617 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | KATE HACKETT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | MARK HANDELMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | VINCENT SANTO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | STACEY CHIZZIK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | STEPHANIE GOLUB |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | BRIAN RILEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | MARK OWENS |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 216436 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 145531 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 199813 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 182493 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 166400 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 190688 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | chairman |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | CEO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | CFO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | ASSISTANT ED |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | PRINCIPAL |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | PSYCHIATRIST |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/Form990TFiledInd | 0 | true |
| IRS990/FormationYr | 0 | 1953 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/ConsolidatedBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/FundraisingDirectExpensesAmt | 0 | 0 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GamingDirectExpensesAmt | 0 | 0 |
| IRS990/GamingGrossIncomeAmt | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 9 |
| IRS990/GovernmentGrantsAmt | 0 | 1092773 |
| IRS990/GrantsPayableGrp/BOYAmt | 0 | 0 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 0 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossReceiptsAmt | 0 | 15312093 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 0 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IncmFromInvestBondProceedsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | false |
| IRS990/IndependentVotingMemberCnt | 0 | 9 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 8 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartVInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 14829 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 102716 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 117545 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 147265 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 34919 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 182184 |
| IRS990/IntangibleAssetsGrp/BOYAmt | 0 | 0 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 36733 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 116544 |
| IRS990/InterestGrp/TotalAmt | 0 | 153277 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 0 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 352 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 352 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 0 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 3790437 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 3522222 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 3209518 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 6999955 |
| IRS990/LegalDomicileStateCd | 0 | NY |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 0 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | THE LEAGUE SCHOOL PROVIDES EDUCATIONAL (AGES 5-21) AND MENTAL HEALTH PROGRAMS FOR STUDENTS WITH INTELLECTUAL, DEVELOPMENTAL AND/OR PHYCHIATRIC DISABILITIES. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 2293587 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 2179222 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | -15129006 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | -17103118 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeFromGamingGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 41471 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 162298 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 1275859 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 1438157 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 12367 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 176518 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 188885 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 0 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 16927 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 78214 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 2031775 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 2109989 |
| IRS990/OtherExpensesGrp/Desc | 0 | REPAIRS AND MAINTENANCE |
| IRS990/OtherExpensesGrp/Desc | 1 | PROGRAM SUPPLIES |
| IRS990/OtherExpensesGrp/Desc | 2 | DUES AND SUBSCRIPTIONS |
| IRS990/OtherExpensesGrp/Desc | 3 | MISCELLANEOUS EXPENSE |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 53702 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 9781 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 24728 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 326850 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 167384 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 16041 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 14450 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 380552 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 167384 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 25822 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 39178 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 15908021 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 18803417 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | OTHER INCOME |
| IRS990/OtherRevenueMiscGrp/ExclusionAmt | 0 | 1120 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 1120 |
| IRS990/OtherRevenueTotalAmt | 0 | 1120 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 231728 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 8782753 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 9014481 |
| IRS990/OthNotesLoansReceivableNetGrp/BOYAmt | 0 | 0 |
| IRS990/OthNotesLoansReceivableNetGrp/EOYAmt | 0 | 0 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PaymentsToAffiliatesGrp/TotalAmt | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 60545 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 882356 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 942901 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 15898 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 400768 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 416666 |
| IRS990/PermanentlyRstrNetAssetsGrp/BOYAmt | 0 | 0 |
| IRS990/PermanentlyRstrNetAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 0 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 0 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 104853 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 7970 |
| IRS990/PrincipalOfficerNm | 0 | MARK HANDELMAN |
| IRS990/PriorPeriodAdjustmentsAmt | 0 | -393485 |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 611600 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 611600 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 611600 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | BOARD OF EDUCATION |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | MEDICAID |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | INTEGRATED DAYCARE |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 11623433 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 2523805 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 70610 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 11623433 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 2523805 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 70610 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | THE SCHOOL AGE PROGRAM OF LEAGUE SCHOOL IS A DAY TREATMENT PROGRAM FOR STUDENTS AGES 5 THROUGH 21 WITH DEVELOPMENTAL DISABILITIES AND PSYCHIATRIC DISORDERS. THE PROGRAM IS OPERATIONAL FOR TWELVE MONTHS IN TWO SECTIONS; THE TEN MONTH STANDARD SCHOOL SESSION AND TWO MONTH SUMMER SESSION. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 6932773 |
| IRS990/ProgSrvcAccomActy2Grp/RevenueAmt | 0 | 6996663 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 289920 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 449 |
| IRS990/PymtTravelEntrtnmntPubOfclGrp/TotalAmt | 0 | 0 |
| IRS990/PYOtherExpensesAmt | 0 | 4070305 |
| IRS990/PYOtherRevenueAmt | 0 | 903 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 13966276 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -3009116 |